C
Caspar M. Ammann
Researcher at National Center for Atmospheric Research
Publications - 80
Citations - 10123
Caspar M. Ammann is an academic researcher from National Center for Atmospheric Research. The author has contributed to research in topics: Climate change & Climate model. The author has an hindex of 40, co-authored 80 publications receiving 9248 citations. Previous affiliations of Caspar M. Ammann include University of Massachusetts Amherst & University Corporation for Atmospheric Research.
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Journal ArticleDOI
Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly
Michael E. Mann,Zhihua Zhang,Scott Rutherford,Raymond S. Bradley,Malcolm K. Hughes,Drew Shindell,Caspar M. Ammann,Greg Faluvegi,Fenbiao Ni +8 more
TL;DR: The Medieval period is found to display warmth that matches or exceeds that of the past decade in some regions, but which falls well below recent levels globally, and the Little Ice Age is marked by a tendency for La Niña–like conditions in the tropical Pacific.
Journal ArticleDOI
Recent Warming Reverses Long-Term Arctic Cooling
Darrell S. Kaufman,David P. Schneider,Nicholas P. McKay,Caspar M. Ammann,Raymond S. Bradley,Keith R. Briffa,Gifford H. Miller,Bette L. Otto-Bliesner,Jonathan T. Overpeck,Bo Møllesøe Vinther +9 more
TL;DR: A synthesis of decadally resolved proxy temperature records from poleward of 60°N covering the past 2000 years indicates that a pervasive cooling in progress 2000 years ago continued through the Middle Ages and into the Little Ice Age.
Journal ArticleDOI
High-resolution palaeoclimatology of the last millennium: a review of current status and future prospects:
Philip Jones,Keith R. Briffa,Timothy J. Osborn,Janice M. Lough,T. D. van Ommen,Bo Møllesøe Vinther,Jürg Luterbacher,Eugene R. Wahl,Francis W. Zwiers,Michael E. Mann,Gavin A. Schmidt,Caspar M. Ammann,Brendan M. Buckley,Kim M. Cobb,Jan Esper,Hugues Goosse,Nicholas E. Graham,Eystein Jansen,Thorsten Kiefer,C. Kull,Marcel Küttel,Ellen Mosley-Thompson,Jonathan T. Overpeck,Nadja Riedwyl,Michael Schulz,Alexander W. Tudhope,Ricardo Villalba,Heinz Wanner,Eric W. Wolff,Elena Xoplaki +29 more
TL;DR: A review of late-Holocene palaeoclimaoclimatology represents the results from a PAGES/CLIVAR Intersection Panel meeting that took place in June 2006 as mentioned in this paper, emphasizing current issues in their use for climate reconstruction; various approaches that have been adopted to combine multiple climate proxy records to provide estimates of past annual-to-decadal timescale Northern Hemisphere surface temperatures and other climate variables, such as large-scale circulation indices; and the forcing histories used in climate model simulations of the past millennium.
Journal ArticleDOI
Volcanic forcing of climate over the past 1500 years: An improved ice core-based index for climate models
TL;DR: This paper extracted volcanic sulfate signals from each ice core record by applying a high-pass loess filter to the time series and examining peaks that exceed twice the 31-year running median absolute deviation.
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Proxy evidence for an El Niño-like response to volcanic forcing.
TL;DR: A significant, multi-year, El Niño-like response to explosive tropical volcanic forcing over the past several centuries is demonstrated, shedding light on how the tropical Pacific ocean–atmosphere system may respond to exogenous radiative forcing.